package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
@Autowired
private StringRedisTemplate stringRedisTemplate;
    @Override
    public List<ShopType> typeList() {
        // 1.查询redis中是否有redis缓存
        String key = "cache:shop:type";
        String shopJson = stringRedisTemplate.opsForValue().get(key);
        if (StrUtil.isNotBlank(shopJson)) {
            // 2.存在，直接返回
            return JSONUtil.toList(shopJson, ShopType.class);
        }
        // 3.不存在，查询数据库
        List<ShopType> shopTypes = query().orderByAsc("sort").list();
        if (shopTypes == null) {
            // 4.不存在，返回错误
            return null;
        }
        // 5.存在，写入redis
        stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shopTypes));
        // 6.返回
        return shopTypes;
    }
}
